Mbewin davis



UNITED sTATEs PATENT oEEioE.

MERVVIN DAVIS, OF NE\V YORK, N. Y.

PRINTING-PRESS.

Specification of Letters Patent No. 13,335, dated July 24, 1855.

To all whom it may concern:

Be it known that- I, MERwIN DAVIS, of the city, county,'and State of New York, have invented certain new and useful Improvements in the Construction of Printing- Presses, which I denominate the Oscillating Printing-Press; and I do hereby declare t-he following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which- Figure l, is a side elevat-ion. Fig. 2, is a vertical section. Fig. 3, is a similar section, showing the parts in the position in which the sheets are received. Fig. 4, is a plan of t-he bed, and Fig. 5 is an end elevation showing the fingers of the fly for laying the sheet.

The object of my invention is to produce a Cheap and rapid printing press which shall work with less-power than those now in use, all of which advantages I have attained in the present structure, as I have thoroughly tested with the practical machine now in operation.

The distinguishing characteristic of my press is a straight or plane bed, which is made to oscillate upon st-andards on a center or axis instead of sliding as is the case with ordinary cylinder presses and applying these to a segment of al cylinder platen which shallv adjust itself thereto, and which also vibrates. The other parts are all constructed and arranged with regard t-o these features of construction and are described in the details as follows.

My machine is made as follows: There is a suitable iron frame made, shown in the drawing and designated by the letter a. Near the foundation of this frame at the lower cross rail, there are bearings for an axis Z) on which the'bed is supported and turns. An arm or standard b connects the bed b2 with the axis b above named and elevates it to the proper point. The rear edge of the bed, has a plate b3 attached to it, in form the segment of a cylinder, for the purpose of an ink distributer. To cause the bed to osc-illate I connect the standard b with a crank c on the main shaft c by a connecting rod or pitman c2 which is jointed to the standard at a proper distance above the axis b to cause it to oscillate with the length of crank used far enough for the purpose intended. In Fig. 3, the bed is shown at the extreme limitof its forward motion in Fig. 2 it is receding.

The platform Z is suspended in adjustable boxes el that slide Aup and down in the frame regulated by set screws, that adjust the pressure. The construction of this platen is peculiar and important. It is as follows: I take the distance between the axis b and the center of motion of the platen or axis (l2 and divide it into a number of equal parts, apportioning a certain number to the length between the lower axis and bed, the others to the radius of motion of the platen, then divide the radius of the platen into the same number of parts and take the same proportional distance from the axis, to the periphery that the platen bears to the bed, which is the point on which the circle is struck which the segment platen is formed on. This within the practical limits of t-he machine, is the curve that meets the straight line of the oscillating bed before described, so as to give the impression, for inking the type. Inking rollers c c are so arranged in the frame as to have the bed with the form of types on it pass directly under and in contact with them as clearly shown in Fig. 2. The ink fountain of the ordinary description (not shown in the drawing) and the distributing rollers j", are placed lower down so as only to deliver the ink into the distributing table or plate b3, from which it`-is transferred at each forward vibration onto the inking rollers under which plate b3 passes.

The apparatus for taking the sheet and throwing itoff is as follows: The paper board with the leaf of paper thereon is placed at g, the sheets are taken singly by Lhan'd, and laid against litt-le gages at its front edge at 7L and under fingers 71,2 on the slide h, which are at that time elevated above the slide as shown in Fig. 2, and held by a small catch (not represented). When the sheet is placed the fingers are let down upon it, and hold it steady. The slide h is connected with arm h3 on an axis just below by small connecting rods L* and from this same axis a lever projects downward as seen at h5 Fig. 3, so as to be struck by the front part of the bed by which the slide is thrustout toward the platen as shown in said gure into a position to deliver the sheet. This movment of the slide turns the gages h', which are on a shaft just below it, down o-ut of the way, and on the return of the slide they move back into place.4 When the slide h reaches its limit of motion a stout arm on the axis of the lingers h2, lettered 71.6, strikes the platen and raises them, while at the same instant the fingers on the farther edge of t-he platen at 'L' close down and seize the edge of the paper confining it to the platen. This closing of the fingers is caused by the lever cam z" on the side of the frame seen in Fig. 2. When the paper is thus held, the bed and platen move backward together with the same velocity, which is insured by the two being geared together (see Fig. 3,) and the sheet of paper receives its impression. As soon as the bed and platen separate the platen swings forward again into the position Fig. 3, which motion is caused by al small wheel 7c on the axis of the platen (see Fig. 1,) that gears into the segment 7c on the upper end of one arm of bent lever 7c, the other arm of which extends out horizontally to a point below the main shaft c where it bears a wrist that wo-rks in a grooved cam m on that shaft of a configuration to give the proper motions. When the platen returns forward the sheet of paper hangs down in front of the ily. This fly is a set of long wooden fingers seen at ny Figs. 2, 3, and 5. l/Vhen not in action the upper ends of the lingers rest up against the front edge of the bed as seen in Figs. 2 and 5, but when the bed comes forward to the point when the sheet is suspended, the small projections or Wrist n. strikes a piece 0 upon the frame which throws the upper end quickly over and the fingers of the platen being at the same instant opened by the bed, raising the cam the sheet released therefrom is by fingers '11, thrown down upon the heap p below, in which position the fingers are represented in Fig. 3.

To prevent the printed sheet from being inked as it rises in front of the inking rollers after leaving the forni as shown in Fig. 2, I place a roller rbetween said inking rollers and the platen around which a cloth is wound shown by redlines in the drawing, (the paper being represented by blue lines). To the outer edge of the cloth I affix a wooden rod s which is caught by two projections, projecting one from each rear corner of the platen and the cloth is thereby unwound from the roller r. A cord wound around the roller at the end and attached to a counter weight 1" causes the cloth, as the platen recedes to wind on again. To make register, points can be used in the slide. They are attached to an arm on axis under the paper board to which axis there is another crooked arm u which the bed strikes and withdraws the point before the slide is thrust out toward the platen as before described.

This machine is moved in the following way: On the axis of the main shaft c there is a fly wheel w of large diameter, from which a belt passes to a small driving pulley w, on a stud in the frame. This wheel maybe driven by hand or other power, or the band from the fiy wheel may be at once taken to a pulley as the driving power. To balance the bed I employ a counter weight y aflixed to the lower end of lever y, said lever having its fulcrum on the frame at y2 and its upper end attached by a coupling bar g3, with the bed as seen Figs. l and 2.

Having thus fully described my new oscillating printing press what I claim therein and desire to secure by Letters Pat-ent isl. The oscillating bed having a plain surface and operating substantially as herein described and cont-radistinguished from a rotating bed or sliding bed by oscillating between two given points.

2. I also claim the construction and operation of the platen in combination with said bed as herein specified.

3. I also claim the adaptation and combination of the well known fly n for laying the sheets, the slide z, for the reception and delivery of the paper, and t-he inking apparatus b3 e e and f to the new construction and arrangement of the bed b2 and pla-ten CZ, substantially as above made known.

MERVIN DAVIS.

l/Vitnesses YVM. S. PENDLETON, JACOB I-IAZEL, J r. 

